Lawyers for a Catholic advocacy group that sued San Francisco for condemning the Vatican's policy on same-sex adoptions are comparing the city's supervisors to Nazis laying the groundwork for the slaughter of Jews.

In a statement responding to last week's ruling by a federal appeals court in the city's favor, Richard Thompson, president and chief counsel of the Thomas More Law Center, used a German term for the Nazi policy of forced conformity to party doctrine and the elimination of opposition groups in the 1930s:

"It is not a stretch to compare the San Francisco board's actions to that of the Nazi Germany policy of Gleichschaltung, vilifying Jews as an auxiliary to and laying the groundwork for more repressive policies, including the final solution of extermination."

He was referring to the supervisors' March 2006 resolution denouncing a Vatican order to Catholic Charities not to place adoptive children with same-sex couples. In the decree, Cardinal William Levada, the former San Francisco archbishop who now heads the church's Congregation for the Doctrine of the Faith, said allowing gay or lesbian couples to adopt children "would actually mean doing violence to these children."

The nonbinding board resolution, sponsored by then-Supervisor Tom Ammiano, said the Vatican order contained "hateful and discriminatory rhetoric" and urged local Catholic officials, including Levada's successor as archbishop, George Niederauer, to disregard it. In response, Catholic Charities of San Francisco stopped placing children for adoption with any families.

In the lawsuit, the Catholic League for Religious and Civil Rights accused the city of acting with hostility toward Catholicism in violation of the constitutional requirement of government neutrality. But the Ninth U.S. Circuit Court of Appeals in San Francisco said the supervisors had acted for a legal, secular purpose, to protect same-sex couples from discrimination, and not to express disapproval of Catholicism.

The Thomas More Law Center, which represents the plaintiffs, said it would ask the full appeals court for a rehearing and then appeal to the U.S. Supreme Court. According to the law center's Web page, its mission is "to defend and protect Christians and their religious beliefs in the public square."

"In total disregard for the Constitution, homosexual activists in positions of authority in San Francisco have ... misused the instruments of the government to attack the Catholic Church," said attorney Robert Muise, who argued the case.

"We're not saying that the resolution is going to lead toward extermination of Catholics," Brian Rooney, attorney and spokesman for the law center, said Tuesday. "The problem with having governments vilifying religions and their tenets is that it's a slippery slope to instigate acts of violence."

Ammiano, a Catholic and now a Democratic state assemblyman, said the law center's comments represent "a very unhealthy hysteria" that "trivializes what the Nazis did." With such statements, he said, "the Catholic hierarchy is ... divorcing the true believers and alienating them from the mother church."